For nearly three hours, Weber picked out gravel and debris from the woman's hair and emptied buckets of muddied rinse water.

Their wives, disdainful of the muddy waters of the Amazon, sent linens to Portugal to be laundered...

Some of the accusations undoubtedly stand up and shine a light on the often-murky business of Chinese science.

You can see we fill up the tank about halfway with murky water

A layer of microorganisms at the top of the sand bed consumes biological and other organic contaminants, while the sand below removes contaminants that cause cloudiness and odor.